Clean holes and loose walls with plaster

Again and again I read how to use gypsum (plaster, plaster, etc.) advised. Remember, in the application, whether the use of plaster is advisable.

I just want to give a few things here.

Never mix gypsum and cement or cementitious plasters, especially if applied in wet or outdoor areas. Gypsum has a high water absorption and can even destroy concrete.

Do you use plaster alone or in conjunction with plaster (only lime plaster only) for plastering damaged areas in the wall area, then pay attention to the masonry. Particularly at risk here is the outer masonry. If we have an unreinforced solid masonry, non-dry masonry or concrete walls, we can expect a colder wall surface indoors. Due to the lower wall temperature it comes to the condensation of moisture, this is absorbed by the gypsum in the long run more moisture and it can lead to mold growth. With insulated hollow brick masonry (Poroton, Wieneberger, etc.) this is unlikely.

Who is inexperienced in the processing of plaster, I advise to more expensive cleaning, these are usually tailored to the needs of amateur craftsmen and can also by applying a steel trowel make a good connection to the wall surface.

It is always advisable to soak the surfaces to be plastered in order to remove dust and to achieve a better bond between the binder and the plaster base.

How to Patch Plaster Walls | June 2023